US Bridges

Prairie City Road over Antelope Ck

Fair

Perkins County, South Dakota · 17 W 14.7 S Bison · Structure no. 000000053070437

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
75
2022 count
Owner
County
County Highway Agency

About this bridge

Prairie City Road over Antelope Ck is a prestressed concrete tee beam carrying Prairie City Road over Antelope Ck in Perkins County, South Dakota. It was built in 1977, so it is 48 years old, younger than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 75 vehicles a day, roughly 3% of them trucks, projected to reach 75 by 2032. The structure is 30 ft (9.1 m) long and 23 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesPrairie City Road
CrossesAntelope Ck
Location17 W 14.7 S Bison
RouteCounty Highway 0
CountyPerkins County
StateSouth Dakota
Coordinates45.31626, -102.81526
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width23 ft (7.1 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic75 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Prairie City Road over Antelope Ck built?

It was built in 1977, making it 48 years old in 2025.

What condition is Prairie City Road over Antelope Ck in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2023.

How much traffic does Prairie City Road over Antelope Ck carry?

About 75 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Prairie City Road over Antelope Ck?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 23 ft wide.

Who owns Prairie City Road over Antelope Ck?

It is owned by the County Highway Agency.